[目的]探讨鳖甲寡肽I-C-F-6对乙醇诱导的小鼠慢性肝损伤的预防作用,并分析其可能的保护机制。[方法]将90只ICR小鼠随机分为正常对照组、模型组、寡肽低剂量组(0.12 mg/kg)、寡肽高剂量组(0.24 mg/kg)、阳性药组(240.00 mg/kg)。正常对...[目的]探讨鳖甲寡肽I-C-F-6对乙醇诱导的小鼠慢性肝损伤的预防作用,并分析其可能的保护机制。[方法]将90只ICR小鼠随机分为正常对照组、模型组、寡肽低剂量组(0.12 mg/kg)、寡肽高剂量组(0.24 mg/kg)、阳性药组(240.00 mg/kg)。正常对照组和模型组均皮下注射生理盐水(0.12 m L/kg);寡肽低剂量组和寡肽高剂量组分别皮下注射寡肽的生理盐水溶液(0.12 m L/kg);阳性药组灌胃还原型谷胱甘肽生理盐水溶液(0.12 m L/kg),同时除正常对照组外,其余4组给予灌胃40%乙醇(0.12 m L/kg),每日1次,连续16周。16周后,末次给乙醇12 h后处死小鼠采集血液样品和肝组织样品,测定血清谷丙转氨酶(ALT)、谷草转氨酶(AST)和碱性磷酸酶(AKP)的活力,肝组织超氧化物歧化酶(SOD)活力、丙二醛含量(MDA),单胺氧化酶(MAO)的活力,并进行病理组织学检查。[结果]鳖甲寡肽I-C-F-6使灌胃乙醇后小鼠体内ALT、AST、MDA、MAO、AKP的含量显著降低(P<0.05),肝组织匀浆中SOD的活力明显升高(P<0.05),肝脏病理损伤减轻。[结论]鳖甲寡肽I-C-F-6对小鼠慢性酒精性肝损伤具有一定的预防保护作用,其机制可能与抑制脂质过氧化,清除自由基,升高SOD的活力有关。展开更多
Recently,AnstÖter and co-workers[J.Am.Chem.Soc.141,6132(2019)]have provided the first photoelectron spectroscopic determination of the anion-πbond strength(De)using iodide-hexafluorobenzene(I-·C6F6)as the a...Recently,AnstÖter and co-workers[J.Am.Chem.Soc.141,6132(2019)]have provided the first photoelectron spectroscopic determination of the anion-πbond strength(De)using iodide-hexafluorobenzene(I-·C6F6)as the archetypical system.In combination with an equation-of-motion coupled cluster theory,namely EOM-IP-CCSD(d T),using Dunning’s aug-cc-p VDZ(a VDZ)basis set,Dein I-·C6F6 was found to be-0.53 e V with an uncertainty less than±0.03 e V.The interaction was claimed to arise for a large part from correlation forces(41%)with only a 23%contribution from electrostatic forces.In the present work,we performed the coupled-cluster with single and double and perturbative triple excitations,CCSD(T),calculations.We found that CCSD(T)/a VDZ can have an uncertainty up to 0.113 e V due to the basis set incompleteness.Our calculations disclosed that the previous calculations on the electrostatic contribution are concealed by the contributions from the exchange and Pauli repulsion.The electrostatic contribution is actually determinant,being more than double of the correlation contribution in the I-·C6F6 complex at the equilibrium binding distance.展开更多
文摘[目的]探讨鳖甲寡肽I-C-F-6对乙醇诱导的小鼠慢性肝损伤的预防作用,并分析其可能的保护机制。[方法]将90只ICR小鼠随机分为正常对照组、模型组、寡肽低剂量组(0.12 mg/kg)、寡肽高剂量组(0.24 mg/kg)、阳性药组(240.00 mg/kg)。正常对照组和模型组均皮下注射生理盐水(0.12 m L/kg);寡肽低剂量组和寡肽高剂量组分别皮下注射寡肽的生理盐水溶液(0.12 m L/kg);阳性药组灌胃还原型谷胱甘肽生理盐水溶液(0.12 m L/kg),同时除正常对照组外,其余4组给予灌胃40%乙醇(0.12 m L/kg),每日1次,连续16周。16周后,末次给乙醇12 h后处死小鼠采集血液样品和肝组织样品,测定血清谷丙转氨酶(ALT)、谷草转氨酶(AST)和碱性磷酸酶(AKP)的活力,肝组织超氧化物歧化酶(SOD)活力、丙二醛含量(MDA),单胺氧化酶(MAO)的活力,并进行病理组织学检查。[结果]鳖甲寡肽I-C-F-6使灌胃乙醇后小鼠体内ALT、AST、MDA、MAO、AKP的含量显著降低(P<0.05),肝组织匀浆中SOD的活力明显升高(P<0.05),肝脏病理损伤减轻。[结论]鳖甲寡肽I-C-F-6对小鼠慢性酒精性肝损伤具有一定的预防保护作用,其机制可能与抑制脂质过氧化,清除自由基,升高SOD的活力有关。
基金supported by the National Natural Science Foundation of China(No.21688102 and No.91027044)。
文摘Recently,AnstÖter and co-workers[J.Am.Chem.Soc.141,6132(2019)]have provided the first photoelectron spectroscopic determination of the anion-πbond strength(De)using iodide-hexafluorobenzene(I-·C6F6)as the archetypical system.In combination with an equation-of-motion coupled cluster theory,namely EOM-IP-CCSD(d T),using Dunning’s aug-cc-p VDZ(a VDZ)basis set,Dein I-·C6F6 was found to be-0.53 e V with an uncertainty less than±0.03 e V.The interaction was claimed to arise for a large part from correlation forces(41%)with only a 23%contribution from electrostatic forces.In the present work,we performed the coupled-cluster with single and double and perturbative triple excitations,CCSD(T),calculations.We found that CCSD(T)/a VDZ can have an uncertainty up to 0.113 e V due to the basis set incompleteness.Our calculations disclosed that the previous calculations on the electrostatic contribution are concealed by the contributions from the exchange and Pauli repulsion.The electrostatic contribution is actually determinant,being more than double of the correlation contribution in the I-·C6F6 complex at the equilibrium binding distance.
